carter afb 500 cfm

Hey guys !
I am searching for a carter afb 500 cfm for a 273 commando w/ 4sp. 1964 -1967 engines . any one of those years will work as long as they are 500 cfm .
3853s - 1965
4119s - 1966
4294s - 1967
anyone of these carbs will work for a 4 sp. car .
I prefer something that not hacked up and complete. I can rebuild it if need be.
Thanks !
john